package audit

import (
	"context"
	"os"
	"testing"
	"time"

	"github.com/jackc/pgx/v5/pgxpool"
)

func TestMaintenancePartitionsRetentionAndIdempotency(t *testing.T) {
	databaseURL := os.Getenv("AUDIT_MAINTENANCE_TEST_DATABASE_URL")
	if databaseURL == "" {
		t.Skip("AUDIT_MAINTENANCE_TEST_DATABASE_URL is not configured")
	}
	ctx := context.Background()
	pool, err := pgxpool.New(ctx, databaseURL)
	if err != nil {
		t.Fatal(err)
	}
	defer pool.Close()
	const oldID = "44444444-4444-4444-8444-444444444444"
	const currentID = "55555555-5555-4555-8555-555555555555"
	_, err = pool.Exec(ctx, `INSERT INTO gateway.audit_events(id,request_id,protocol,status_code,recorded_at) VALUES
		($1,'maintenance-old','/v1/test',200,'2026-01-15T00:00:00Z'),
		($2,'maintenance-current','/v1/test',200,'2026-08-10T00:00:00Z')`, oldID, currentID)
	if err != nil {
		t.Fatal(err)
	}
	now := time.Date(2026, 8, 11, 0, 0, 0, 0, time.UTC)
	first, err := NewMaintenance(pool, 300*24*time.Hour, 730*24*time.Hour, 1).Run(ctx, now)
	if err != nil {
		t.Fatal(err)
	}
	if !contains(first.CreatedPartitions, "audit_events_202601") || !contains(first.CreatedPartitions, "audit_events_202608") {
		t.Fatalf("expected old and current partitions, got %#v", first.CreatedPartitions)
	}
	second, err := NewMaintenance(pool, 90*24*time.Hour, 730*24*time.Hour, 1).Run(ctx, now)
	if err != nil {
		t.Fatal(err)
	}
	if !contains(second.DroppedPartitions, "audit_events_202601") {
		t.Fatalf("expected stale partition to be dropped, got %#v", second.DroppedPartitions)
	}
	var currentTable string
	if err := pool.QueryRow(ctx, `SELECT tableoid::regclass::text FROM gateway.audit_events WHERE id=$1`, currentID).Scan(&currentTable); err != nil {
		t.Fatal(err)
	}
	if currentTable != "gateway.audit_events_202608" && currentTable != "audit_events_202608" {
		t.Fatalf("current row was not routed to monthly partition: %s", currentTable)
	}
	var oldCount int
	if err := pool.QueryRow(ctx, `SELECT count(*) FROM gateway.audit_events WHERE id=$1`, oldID).Scan(&oldCount); err != nil || oldCount != 0 {
		t.Fatalf("expired row still exists: count=%d err=%v", oldCount, err)
	}
	third, err := NewMaintenance(pool, 90*24*time.Hour, 730*24*time.Hour, 1).Run(ctx, now)
	if err != nil {
		t.Fatal(err)
	}
	if len(third.CreatedPartitions) != 0 || len(third.DroppedPartitions) != 0 {
		t.Fatalf("maintenance must be idempotent: %#v", third)
	}
}

func contains(values []string, wanted string) bool {
	for _, value := range values {
		if value == wanted {
			return true
		}
	}
	return false
}